ISO-120-ACE General Purpose Relay Equivalent & Substitute Parts

Part Overview

The ISO-120-ACE is a general purpose relay manufactured by Mueller Electric Co, classified as a SPST-NO (Single Pole Single Throw - Normally Open) configuration with 4 Form A contacts. The relay operates at 120VAC coil voltage with a 5A contact rating and is designed for chassis mount applications using screw terminal connections. This part is discontinued at DiGi Electronics, necessitating identification of equivalent substitute components that maintain identical electrical and mechanical specifications for direct replacement in existing applications.

Substiute Parts

ISO-120-ACE

Mueller Electric CoIn Stock: 800ISO-120-ACE Datasheet

Current PartRFQ

ISO-120-ACE

ATC-Diversified ElectronicsIn Stock: 1165ISO-120-ACE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ISO-120-ACE is determined by strict equivalence across the following critical parameters:

Electrical Specifications: Contact form configuration (SPST-NO with 4 Form A contacts), coil voltage (120VAC), contact current rating (5A), and switching voltage (120VAC) must be identical to ensure functional compatibility in the circuit.

Mechanical Specifications: Mounting type (Chassis Mount) and termination style (Screw Terminal) must match to ensure physical compatibility with existing PCB layouts and enclosure designs.

Operational Characteristics: Coil type (Non Latching), operate time (6 ms), and release time (2.5 ms) must remain constant to preserve circuit timing and control logic.

Environmental Specifications: Operating temperature range (-20°C ~ 55°C) and Moisture Sensitivity Level (MSL 1) must be maintained for reliability in the intended application environment.

Parts meeting all these criteria are classified as direct equivalents and may be substituted without circuit redesign or validation testing.

Parameter Comparison

Engineering Selection Recommendations

The ISO-120-ACE manufactured by ATC-Diversified Electronics is a direct electrical and mechanical equivalent to the discontinued Mueller Electric Co ISO-120-ACE. Both components share identical contact configurations, coil voltage specifications, current ratings, switching characteristics, and operating parameters.

The ATC-Diversified Electronics variant is currently in active production with 1064 units in stock, providing supply continuity for applications requiring the ISO-120-ACE specification. This substitute carries UL approval agency certification, supporting compliance requirements in regulated applications.

The switching voltage specification differs in notation (120VAC - Nom versus 120VAC - Max), reflecting manufacturer documentation conventions rather than functional divergence. Both designations indicate 120VAC operation within the relay's design envelope.

RoHS compliance status differs between the original and substitute components. The Mueller Electric Co part requires inventory verification for RoHS status, while the ATC-Diversified Electronics equivalent is documented as RoHS non-compliant. Applications subject to RoHS regulatory requirements must address this distinction during component selection.

Frequently Asked Questions (FAQ)

Q: Can the ATC-Diversified Electronics ISO-120-ACE be used as a direct replacement for the discontinued Mueller Electric Co ISO-120-ACE?

A: Yes. Both components are electrically and mechanically identical across all critical parameters: SPST-NO contact configuration with 4 Form A contacts, 120VAC coil voltage, 5A contact rating, 6ms operate time, 2.5ms release time, chassis mount configuration, and screw terminal termination. Direct substitution is supported without circuit modification.

Q: What is the difference between "120VAC - Max" and "120VAC - Nom" switching voltage specifications?

A: These notations reflect different manufacturer documentation standards. "Max" indicates the maximum rated switching voltage, while "Nom" indicates the nominal operating voltage. Both specifications confirm 120VAC operation and do not represent functional differences between the components.

Q: Are there RoHS compliance implications when substituting the ATC-Diversified Electronics part?

A: Yes. The original Mueller Electric Co ISO-120-ACE has undefined RoHS status requiring verification, while the ATC-Diversified Electronics substitute is documented as RoHS non-compliant. Applications subject to RoHS Directive 2011/65/EU or equivalent regulations must evaluate this distinction and confirm compliance requirements with system-level design specifications.

Q: Does the ATC-Diversified Electronics substitute carry any certifications?

A: The ATC-Diversified Electronics ISO-120-ACE carries UL approval agency certification. The original Mueller Electric Co part does not specify an approval agency in the provided documentation.

Q: What packaging is available for the substitute component?

A: The ATC-Diversified Electronics ISO-120-ACE is supplied in Box packaging. The original Mueller Electric Co part does not specify packaging format in the provided documentation.

Q: Are the operating temperature ranges identical between both components?

A: Yes. Both the Mueller Electric Co and ATC-Diversified Electronics ISO-120-ACE variants operate across the identical temperature range of -20°C to 55°C.

Q: What is the Moisture Sensitivity Level (MSL) for both components?

A: Both components are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or assembly processes.